style: fix Annotated pattern in audit_logs.py to resolve Ruff B008 and maintain compatibility

Refactor `app/api/audit_logs.py` to use the `Annotated` type hint pattern while maintaining default values for dependencies using module-level singletons.

- Resolves B008: Function-call in default argument.
- Maintains compatibility with decorators (e.g., `@require_login`) that call the function without explicitly providing the `db` argument.
- Uses standard FastAPI patterns for query parameters with constant defaults.
- No changes to API runtime behavior.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

test_ruff_annotated_none.py

@@ -0,0 +1,6 @@
+from typing import Annotated
+def Depends(x): return x
+def get_db(): return "db"
+DbSession = Annotated[str, Depends(get_db)]
+def test_func(db: DbSession = None):
+    pass